The European Sojourn gently takes you between bustling Amsterdam along the Rhine, Main and Danube Rivers, past windmills, fairytale castles and majestic landscapes to Bucharest. Explore vibrant Cologne, home to Northern Europe’s largest Gothic cathedral, the astonishingly beautiful Kölner Dom. Enjoy a very special 17,000-pipe organ concert at St. Stephen’s Cathedral in charming Passau, located on the colorful confluence of the Inn, Ilz and Danube rivers. An overnight in Budapest means there is plenty of time for fascinating touring opportunities, such as the Jewish Quarter, the famous Thermal Bath, and the boisterous Hungarian Horsemen show. Peeking into Croatia, you will have a chance to meet a local family in Osijek. Glide past the wondrous Iron Gates into Romania and take in the dramatic Belgradchik Fortress, built right into the red-hued rocks. Viking River Cruises offers the finest of Europe’s iconic wonders, with the convenience of unpacking only once.